# Light from a point source in the air falls on a convex spherical glass surface (n = 1.5 and radius of curvature = 20 cm) of a glass medium which extends till infinity on other side . The distance of the light source from the glass surface is 100 cm. At what position the image is formed? 1. at a distance of 200 cm from the glass surface, in the direction of incident light. 2. at a distance of 100 cm from the glass surface, in the direction of incident light. 3. at a distance of 200 cm from the glass surface, in the opposite direction of incident light. 4. at a distance of 100 cm from the glass surface, in the opposite direction of incident light.

Subtopic: Â Refraction at Curved Surface |
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A magician during a show makes a glass lens with $$n=1.47$$ disappear in a trough of liquid. What is the refractive index of the liquid?
1. $$1.47$$
2. $$1.33$$
3. $$0.66$$
4. $$1.5$$

Subtopic: Â Refraction at Curved Surface |
Â 78%
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If $$f=0.5$$ m for a glass lens, what is the power of the lens?
1. $$+0.4$$ D
2. $$+4.0$$ D
3. $$+0.2$$ D
4. $$+2.0$$ D

Subtopic: Â Lenses |
Â 86%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

The radii of curvature of the faces of a double convex lens are $$10$$ cm and $$15$$ cm. Its focal length is $$12$$ cm. What is the refractive index of glass?
1. $$1.3$$
2. $$1.2$$
3. $$1.5$$
4. $$1.4$$

Subtopic: Â Lenses |
Â 81%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

A convex lens has a $$20~\text{cm}$$ focal length in air. What is the focal length in water? (Refractive index of air-water = $$1.33$$, refractive index for air-glass = $$1.5$$)
1. $$+72.72~\text{cm}$$
2. $$+78.2~\text{cm}$$
3. $$-72.72~\text{cm}$$
4. $$+70.2~\text{cm}$$

Subtopic: Â Lenses |
Â 69%
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Find the position of the image formed by the lens combination in the given figure.

 1 Final image is formed 30 cm to the right of the third lens. 2 Final image is formed 20 cm to the left of the third lens. 3 Final image is formed 30 cm to the left of the third lens. 4 Final image is formed 20 cm to the right of the third lens.

Subtopic: Â Lenses |
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What focal length should the reading spectacles have for a person for whom the least distance of distinct vision is $$50~\text{cm}$$?
1. $$-50~\text{cm}$$
2. $$+50~\text{cm}$$
3. $$-60~\text{cm}$$
4. $$+60~\text{cm}$$

Subtopic: Â Lenses |
Â 64%
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The far point of a myopic person is $$80$$ cm in front of the eye. What is the power of the lens required to enable him to see very distant objects clearly?
1. $$-1.25$$ D
2. $$+1.25$$ D
3. $$-2.12$$ D
4. $$+2.12$$ D

Subtopic: Â Human Eye |
Â 70%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

The near point of a hypermetropic person is $$75$$ cm from the eye. What is the power of the lens required to enable the person to read clearly a book held at $$25$$ cm from the eye?
1. $$+2.67$$ D
2. $$-1.25$$ D
3. $$-2.67$$ D
4. $$+1.25$$ D

Subtopic: Â Human Eye |
Â 69%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

The earth takes $$24~\text{h}$$ to rotate once about its axis. How much time does the sun take to shift by $$1^{\circ}$$ when viewed from the earth?
1. $$3~\text{minutes}$$

2. $$2~\text{minutes}$$

3. $$1~\text{minutes}$$

4. $$4~\text{minutes}$$

Subtopic: Â Refraction at Curved Surface |
Â 60%
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